<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script type="text/javascript">
			var w;
			alert(w+":"+typeof(w));
			w="nihao";
			alert(w+":"+typeof(w));
			w=3.15;
			alert(w+":"+typeof(w));
			w=3;
			alert(w+":"+typeof(w));
			w=true;
			alert(w+":"+typeof(w));
			w=null;
			alert(w+":"+typeof(w));
		</script>
	</head>
	<body>
	</body>
</html>
